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US7715862B2 - Coding selection method - Google Patents

Coding selection method Download PDF

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Publication number
US7715862B2
US7715862B2 US11/239,279 US23927905A US7715862B2 US 7715862 B2 US7715862 B2 US 7715862B2 US 23927905 A US23927905 A US 23927905A US 7715862 B2 US7715862 B2 US 7715862B2
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United States
Prior art keywords
power control
control mechanism
specific power
channel quality
mobile station
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
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US11/239,279
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English (en)
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US20060079266A1 (en
Inventor
Eddie Riddington
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Nokia Inc
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Nokia Inc
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Publication of US20060079266A1 publication Critical patent/US20060079266A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

Definitions

  • the invention relates to channel coding in the air interface in telecommunication systems, and specifically to methods used in selecting coding methods.
  • Flexible Layer One based on similar principles that are used in Universal Terrestrial Radio Access Network (UTRAN), is being standardised for the Global System for Mobile communications/Enhanced Data for GSM Evolution (GSM/EDGE) Radio Access Network (GERAN).
  • UTRAN Universal Terrestrial Radio Access Network
  • GSM/EDGE Global System for Mobile communications/Enhanced Data for GSM Evolution
  • GERAN Global System for Mobile communications/Enhanced Data for GSM Evolution
  • Flexible Layer One provides a framework that allows one or more coding schemes to be defined at call set-up according to the quality of service (QoS) requirements of the service to be supported and expected conditions of the radio channel.
  • QoS quality of service
  • these coding schemes are referred to as Transport Format Combinations (TFCs).
  • TFC selection refers to the process of adaptively selecting an appropriate TFC during transmission in order to adapt to changes in the radio environment such as due to fading. It is analogous to the well known ‘link adaptation’ operation used in Adaptive Multi-Rate (AMR) channels.
  • AMR Adaptive Multi-Rate
  • TFC selection On the uplink (UL), maximum TFC selection is, according to standard versions current at the time of writing of this patent application, controlled by the network.
  • the network can signal in-band on the downlink (DL) the maximum TFC that shall be used on the uplink.
  • the network is able select the maximum TFC since the network is aware of the UL radio environment.
  • a similar approach has been proposed for the downlink. In a known proposal, presented during TSG-GERAN meeting #21 (23-27 Aug. 2004), TFC selection would be controlled by the mobile station by signalling in-band on the UL, the maximum TFC that shall be used on the DL. Having the mobile station control the TFC selection in the downlink would be a natural choice, as the mobile station is aware of the DL radio environment. This approach is similar to ‘link adaptation’ operation used in AMR.
  • a method in a cellular telecommunication system for controlling selection of coding methods in the downlink direction of communication with a mobile station.
  • the method comprises at least the steps of
  • a method in a cellular telecommunication system for controlling selection of coding methods in the downlink direction of communication with a mobile station.
  • the method comprises at least the steps of
  • said specific power control mechanism is the Enhanced Power Control (EPC) mechanism.
  • EPC Enhanced Power Control
  • said specific power control mechanism is the Fast Power Control (FPC) mechanism.
  • FPC Fast Power Control
  • the method further comprises the step of selecting a coding method at least in part on the basis of measurement results reflecting the diversity of the corresponding uplink direction of communication.
  • a system in a cellular telecommunications network for controlling selection of coding methods in the downlink direction of communication with a mobile station, comprising at least
  • a system in a cellular telecommunications network for controlling selection of coding methods in the downlink direction of communication with a mobile station comprising at least
  • said specific power control mechanism is the EPC mechanism.
  • said specific power control mechanism is the FPC mechanism.
  • the system further comprises means for selecting a coding method at least in part on the basis of measurement results reflecting the diversity of the corresponding uplink direction of communication.
  • a system in a cellular telecommunications network for controlling selection of coding methods in the downlink direction of communication with a mobile station comprising at least
  • a controller configured to determine if a specific power control mechanism is enabled
  • a transmitter configured to send, as a response to a determination that said specific power control mechanism is not enabled, an indication to the mobile station indicating that said specific power control mechanism is to be enabled
  • a receiver configured to receive a channel quality report from said mobile station associated with said specific power control mechanism
  • a controller configured to select a coding method at least in part on the basis of said received channel quality report.
  • a system in a cellular telecommunications network for controlling selection of coding methods in the downlink direction of communication with a mobile station comprising at least
  • a transmitter configured to send an indication to the mobile station indicating that a specific power control mechanism is to be enabled
  • a receiver configured to receive a channel quality report from said mobile station associated with said specific power control mechanism
  • a controller configured to select a coding method at least in part on the basis of said received channel quality report.
  • said specific power control mechanism is the EPC mechanism.
  • said specific power control mechanism is the FPC mechanism.
  • the system further comprises a controller configured to select a coding method at least in part on the basis of measurement results reflecting the diversity of the corresponding uplink direction of communication.
  • the inventive system is implemented in a network node of a cellular telecommunications network.
  • the invention can be implemented in a base station.
  • a seventh aspect of the invention there is provided a method in a cellular telecommunication system for controlling selection of coding methods in the downlink direction of communication with a mobile station.
  • the method comprises at least the steps of
  • FIG. 1 illustrates a method according to an advantageous embodiment of the invention
  • FIG. 2 illustrates a method according to a further advantageous embodiment of the invention
  • FIG. 3 illustrates a system according to a still further advantageous embodiment of the invention.
  • FIG. 1 illustrates a method according to an advantageous embodiment of the invention.
  • the method comprises determining at 110 if a specific power control mechanism is enabled. If said specific power control mechanism is not enabled, an indication is sent at 120 to the mobile station indicating that said specific power control mechanism is to be enabled. A channel quality report is then received at 130 from said mobile station associated with said specific power control mechanism, and a coding method can be selected at 140 at least in part on the basis of said received channel quality report.
  • FIG. 2 illustrates a further method according to a further advantageous embodiment of the invention.
  • the method comprises the steps of sending 210 an indication to the mobile station indicating that a specific power control mechanism is to be enabled, receiving 220 a channel quality report from said mobile station associated with said specific power control mechanism, and selecting 230 a coding method at least in part on the basis of said received channel quality report.
  • FIG. 3 illustrates a system according to an advantageous embodiment of the invention.
  • the system 310 comprises a controller 320 configured to determine if a specific power control mechanism is enabled, a transmitter 330 configured to send, as a response to a determination that said specific power control mechanism is not enabled, an indication to the mobile station indicating that said specific power control mechanism is to be enabled, a receiver 340 configured to receive a channel quality report from said mobile station associated with said specific power control mechanism, and a controller 350 configured to select a coding method at least in part on the basis of said received channel quality report.
  • the network may utilise information reported by a power control channel quality reporting procedure, such as reporting procedures used for Enhanced Power Control or Fast Power Control, for controlling the TFC selection.
  • a power control channel quality reporting procedure such as reporting procedures used for Enhanced Power Control or Fast Power Control, for controlling the TFC selection.
  • the network can force the mobile to send channel quality reports periodically, for example every 120 ms, by enabling the Enhanced Power Control (EPC) feature by setting a specific flag in the Slow Associated Control CHannel (SACCH) block header, and thereafter use these channel quality reports for determining the appropriate TFC to use on the downlink.
  • EPC Enhanced Power Control
  • SACCH Slow Associated Control CHannel
  • the network may if it wished, maintain normal power control (i.e. adjusting the transmission power once every 480 ms) by maintaining the same power level for four consecutive commands.
  • Decoding performance in the mobile station is generally dependent on the diversity of the channel, which is in turn dependent upon whether frequency hopping is employed or on how fast the mobile is moving.
  • the channel quality reports that are sent using EPC do not contain information correlating with diversity, as the channel quality reports roughly correspond to raw BER (bit error rate) before channel decoding.
  • the network assumes similar channel diversity in the DL as on the UL and uses measurement results of fading, speed of mobile station, or other UL measurements correlated to or reflecting the diversity of the channel in determination of the appropriate TFC to be used on the DL.
  • the network can initiate the Fast Power Control (FPC) mechanism instead.
  • FPC Fast Power Control
  • This embodiment has the advantage, that when FPC is in use the mobile station sends a channel quality report every 20 milliseconds. This would allow TFC selection control to react more quickly to changes in a fading channel, as in severe fading conditions a reaction time of the order of 120 ms may be too slow in practice.
  • the required controller functions can be provided either by a single controller entity or in a distributed manner. At least a part of the controller functions may be provided by a network node such as a base station or a radio network controller.
  • a network node such as a base station or a radio network controller.
  • an appropriate controller entity may be provided in the network side such that it is configured to select a coding method of from a plurality of coding methods at least in part based on a received channel quality report from a mobile station.
  • the controller entity may be configured to send an indication to the mobile station indicating that a specific power control mechanism is to be enabled.
  • a radio network controller may also be configured to receive channel quality reports from mobile stations and to select an appropriate coding method of from a plurality of coding methods at least in part based on said received channel quality reports.
  • the radio network controller may be further configured to send an indication to the mobile station indicating that said specific power control mechanism is to be enabled.
  • the required control functions may be provided by means of one or more data processors.
  • Appropriately adapted computer program code product may be used for implementing the embodiments, when loaded to a computer, for example a processor of any of the nodes associated with a telecommunications system.
  • the program code means may, for example, perform the generation of messages and/or information elements, interpretation and so forth.
  • the program code product for providing the operation may be stored on and provided by means of a carrier medium such as a carrier disc, card or tape. A possibility is to download the program code product via a data network.
  • the invention has several advantages.
  • the invention provides a way to control TFC selection in the downlink direction. Especially, the approach based on EPC would require no new signalling.
  • EPC is a standardised 3GPP Rel-5 feature, and according to 3GPP Rel-5 standards support of EPC is mandatory in the mobile and optional in the network.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
US11/239,279 2004-10-08 2005-09-30 Coding selection method Expired - Fee Related US7715862B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0422394.7 2004-10-08
GBGB0422394.7A GB0422394D0 (en) 2004-10-08 2004-10-08 Coding selection method

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US20060079266A1 US20060079266A1 (en) 2006-04-13
US7715862B2 true US7715862B2 (en) 2010-05-11

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US (1) US7715862B2 (fr)
EP (1) EP1797662A1 (fr)
CN (1) CN101023615A (fr)
AU (1) AU2005290919A1 (fr)
CA (1) CA2582772A1 (fr)
GB (1) GB0422394D0 (fr)
PE (1) PE20060809A1 (fr)
TW (1) TW200625847A (fr)
WO (1) WO2006038113A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130022008A1 (en) * 2010-03-31 2013-01-24 Huawei Technologies Co., Ltd Method and Apparatus of Communication

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2914480B1 (fr) * 2007-03-30 2010-09-03 Canon Kk Dispositifs et procedes d'emission et reception, via un reseau, d'un contenu sonore, produit programme d'ordinateur et moyen de stockage correspondants.

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WO2000013362A1 (fr) 1998-08-28 2000-03-09 Siemens Aktiengesellschaft Procede et dispositif pour adapter un debit binaire de transmission ou une puissance d'emission a la qualite de transmission d'un canal de transmission
CN1383335A (zh) 2001-04-20 2002-12-04 Lg电子株式会社 在反向链路信道上传输数据的系统和方法
US20030153345A1 (en) * 2002-02-12 2003-08-14 Cramer Joseph F. Power control in spread spectrum communications systems
US20040004944A1 (en) * 2002-07-03 2004-01-08 Paul Petrus Selective power control messaging
US20040047425A1 (en) 2001-08-28 2004-03-11 Katsutoshi Itoh Transmission apparatus, transmission control method, reception apparatus, and reception control method
US6751488B2 (en) * 2000-08-24 2004-06-15 Samsung Electro-Mechanics Co., Ltd. Apparatus for operating the cover of a folding type mobile device
WO2004102827A2 (fr) 2003-05-13 2004-11-25 Koninklijke Philips Electronics N.V. Systeme de communication
EP1484934A1 (fr) * 2001-01-19 2004-12-08 Matsushita Electric Industrial Co., Ltd. Ordonnancement et sélection du schema du modulation et codage dans un systéme CDMA
US20050176455A1 (en) * 2004-02-05 2005-08-11 Ranganathan Krishnan Power control in ad-hoc wireless networks
US20050208961A1 (en) * 2000-02-22 2005-09-22 Qualcomm Incorporated Method and apparatus for controlling transmit power of multiple channels in a CDMA communication system
US6983166B2 (en) * 2001-08-20 2006-01-03 Qualcomm, Incorporated Power control for a channel with multiple formats in a communication system
US20060046738A1 (en) * 2004-09-02 2006-03-02 Alcatel Method of interpolating channel quality
US20060234741A1 (en) * 2003-01-29 2006-10-19 Leonardo Provvedi Tfc selection in the uplink
US20060246938A1 (en) * 2005-05-02 2006-11-02 Nokia Corporation Power control in a communication network
US20070258402A1 (en) * 2006-05-03 2007-11-08 Nokia Corporation User Equipment

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WO2000013362A1 (fr) 1998-08-28 2000-03-09 Siemens Aktiengesellschaft Procede et dispositif pour adapter un debit binaire de transmission ou une puissance d'emission a la qualite de transmission d'un canal de transmission
US20050208961A1 (en) * 2000-02-22 2005-09-22 Qualcomm Incorporated Method and apparatus for controlling transmit power of multiple channels in a CDMA communication system
US6751488B2 (en) * 2000-08-24 2004-06-15 Samsung Electro-Mechanics Co., Ltd. Apparatus for operating the cover of a folding type mobile device
EP1484934A1 (fr) * 2001-01-19 2004-12-08 Matsushita Electric Industrial Co., Ltd. Ordonnancement et sélection du schema du modulation et codage dans un systéme CDMA
CN1383335A (zh) 2001-04-20 2002-12-04 Lg电子株式会社 在反向链路信道上传输数据的系统和方法
US6983166B2 (en) * 2001-08-20 2006-01-03 Qualcomm, Incorporated Power control for a channel with multiple formats in a communication system
US20040047425A1 (en) 2001-08-28 2004-03-11 Katsutoshi Itoh Transmission apparatus, transmission control method, reception apparatus, and reception control method
US20030153345A1 (en) * 2002-02-12 2003-08-14 Cramer Joseph F. Power control in spread spectrum communications systems
US20040004944A1 (en) * 2002-07-03 2004-01-08 Paul Petrus Selective power control messaging
US20060234741A1 (en) * 2003-01-29 2006-10-19 Leonardo Provvedi Tfc selection in the uplink
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130022008A1 (en) * 2010-03-31 2013-01-24 Huawei Technologies Co., Ltd Method and Apparatus of Communication
US9712293B2 (en) * 2010-03-31 2017-07-18 Huawei Technologies Co., Ltd. Method and apparatus of communication

Also Published As

Publication number Publication date
GB0422394D0 (en) 2004-11-10
EP1797662A1 (fr) 2007-06-20
AU2005290919A1 (en) 2006-04-13
PE20060809A1 (es) 2006-08-16
WO2006038113A1 (fr) 2006-04-13
CA2582772A1 (fr) 2006-04-13
CN101023615A (zh) 2007-08-22
US20060079266A1 (en) 2006-04-13
TW200625847A (en) 2006-07-16

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